পদ্ধতির তুলনা করুন

	সলোমন ফোর-গ্রুপ ডিজাইন	ফ্যাক্টোরিয়াল এক্সপেরিমেন্ট
ক্ষেত্র	পরীক্ষামূলক নকশা	পরীক্ষামূলক নকশা
পরিবার	Process / pipeline	Process / pipeline
উদ্ভবের বছর	1949	1926–1935
প্রবর্তক	Richard L. Solomon	Ronald A. Fisher
ধরন	True experimental design	Quantitative experimental design
মৌলিক উৎস	Solomon, R. L. (1949). An extension of control group design. Psychological Bulletin, 46(2), 137–150.	Fisher, R. A. (1935). The Design of Experiments. Oliver and Boyd.
অপর নাম	Solomon design, four-group design, Solomon four-group control design, S4GD	factorial design, factorial ANOVA design, multi-factor experiment, crossed-factor design
সম্পর্কিত	5	6
সারসংক্ষেপ	The Solomon Four-Group Design extends the classic pretest-posttest control-group design by adding two groups that receive no pretest, enabling researchers to detect whether the pretest itself alters participants' responses to the treatment. Introduced by Richard L. Solomon in 1949, it remains the gold standard for isolating the independent effect of a pretest and for obtaining unbiased estimates of treatment efficacy.	A factorial experiment is an experimental design in which two or more independent variables (factors) are manipulated simultaneously, and every combination of their levels is tested. Introduced by Ronald Fisher in the 1920s–1930s, it is the standard approach whenever a researcher needs to detect not only the main effect of each factor but also whether the effect of one factor depends on the level of another — the interaction effect.